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Investment Securities - Additional Information (Detail)
$ in Thousands
3 Months Ended
Sep. 30, 2021
USD ($)
Security
Sep. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Security
Investments Debt And Equity Securities [Abstract]      
Sale of investment securities $ 0 $ 0  
Carrying amounts of securities pledged 162,500   $ 180,100
Total investment securities $ 423,525   $ 394,971
Number of securities in unrealized loss position | Security 115    
Fair value of securities in unrealized/unrecognized loss position $ 222,800    
Other-than-temporarily impaired securities | Security 0   0